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Journal of Intelligent Material Systems and Structures
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Modeling Rearrangement Process of Martensite Platelets in a Magnetic Shape Memory Alloy Ni2MnGa Single Crystal under Magnetic Field and (or) Stress Action

J. Y. Gauthier

Laboratoire d’Automatique de Besançon UMR CNRS 6596 24 rue Alain Savary, 25000 BESANÇON, France, jean-yves.gauthier{at}ens2m.fr

C. Lexcellent

Institut FEMTO-ST, Département de Mécanique Appliquée R. Chaléat UMR CNRS 6174 24 rue de l’Épitaphe, 25000 BESANÇON, France

A. Hubert

Laboratoire d’Automatique de Besançon UMR CNRS 6596 24 rue Alain Savary, 25000 BESANÇON, France

J. Abadie

Laboratoire d’Automatique de Besançon UMR CNRS 6596 24 rue Alain Savary, 25000 BESANÇON, France

N. Chaillet

Laboratoire d’Automatique de Besançon UMR CNRS 6596 24 rue Alain Savary, 25000 BESANÇON, France

The aim of the article is the modeling of the rearrangement process between martensite variants in order to use magnetic shape memory alloys (MSMs) as actuators. In the framework of the thermodynamics of irreversible processes, an efficient choice of the internal variables to take into account the magnetic and mechanical actions and a free energy function are stated. The behavior is chosen as magnetically reversible and mechanically irreversible. An equivalence between magnetic field action H and uniaxial stress action {sigma} for the initiation of the rearrangement is established. Finally, model predictions are compared with experimental measurements.

Key Words: magnetic shape memory alloys • reorientation process • single crystal • actuator • modeling

This version was published on March 1, 2007

Journal of Intelligent Material Systems and Structures, Vol. 18, No. 3, 289-299 (2007)
DOI: 10.1177/1045389X06066094
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